What to say to someone who just gave unsolicited, condescending "life advice"- especially when it's of the type Mister Rogers or some other preschool kid's show host loved to dole out.

A: Listen hun, if you're gonna make an open post on a huge forum, and can't take people putting out different opinions from your own, make it on your own personal journal.
Don't start deleting posts just because you can't deal with someone disagreeing with you. That's life.
B: Thank you, Misterr Rogers.